"Incompetence"

I was referred by my GP to be fitted with 24hr blood pressure monitor and in time got an appointment for3 rd March at 9-40am telling me to go to route 105. As it was an early time I had to get a taxi for which I paid £6 I showed my letter to the receptionist then sat in the waiting room for 3/4hr and was then told by a nurse the delay was because my referral letter wa not in my file and it had to be found before I could see a doctor. I sad I didn't think I needed to see a doctor just to get a BP monitor fitted .The nurse was very surprised and said I was in the Parkinson Disease clinic ! They were very apologetic but it wasn't their fault of course.I did mention it had been a waste of my taxi fare and the nurse did say I could request a refund but I declined .I now have to wait for a further appointment.Fortunately I am able bodied and can cope with this inconvenience but do wonder how such a basic mistake could happen.I worked in a GP's surgery long before computers were used and would have been devastated to cause problems to our patients by sheer incompetence whereas these days it appears to be looked at in a very casual way and the patient is just expected to "go home and wait for another appointment"